Download Honeywell TROL-A-TEMP Q674B User's Manual
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T874A,D Zone Thermostats/ Q674B,D,E Subbases Installation Instructions for the Trained Service Technician. Application See Table 1 for thermostat/subbase and system compatibility; see Table 2 for thermostat specifications. For complete Honeywell Trol-A-Temp System specification and application information, refer to the system specification included with the control panel. These T874A,D Zone Thermostats and Q674B,D,E Subbases provide 24 to 30 Vac temperature control in Honeywell Trol-A-Temp heating/cooling zone systems. TABLE 1—THERMOSTAT/SUBBASE AND SYSTEM COMPATIBILITY. Thermostat/ Subbase Model Numbera Mini-Zone T874A/Q674B Zone 1; conventional heat-cool. T874A/Q674D Zones other than zone 1; conventional heat-cool. T874A/Q674E Not applicable T874D/Q674B Not applicable T874D/Q674D Not applicable T874D/Q674E Not applicable a Application Mabs II, Mabs II-L Zone 1; conventional heat-cool. Zones other than zone 1; conventional heat-cool. Not applicable Zone 1; conventional heat-cool. Zones other than zone 1; conventional heat-cool and heat pump. Not applicable Mabs XX Stages Any zone; conventional heat-cool. Single-stage Not applicable Single-stage Any zone; conventional heat-cool. Single-stage Any zone; conventional heat-cool. Multistage Not applicable Multistage Any zone; conventional heat-cool. Multistage Subbase not included with thermostat; order separately. TABLE 2—THERMOSTAT/SUBBASE SPECIFICATIONS. Thermostat/Subbase Order Numbera T874A1465/Q674B1471 T874A1465/Q674D1123 T874A1465/Q674E1379 T874D1801/Q674B1463 T874D1827/Q674B1471 T874D1801/Q674D1115 T874D1827/Q674D1123 T874D1827/Q674E1379 a Switching System HEAT-OFF-COOL None HEAT-OFF-COOL-AUTO HEAT-OFF-COOL HEAT-OFF-COOL None None HEAT-OFF-COOL-AUTO Fan ON-AUTO None ON-AUTO ON-AUTO ON-AUTO None None ON-AUTO Thermostat/ Subbase Color White/Gray White/Gray White/Gray Beige/Brown White/Gray Beige/Brown White/Gray White/Gray Anticipator Range (A) Heating Cooling (Adj.) (Fixed) Stg. 1— Stg. 1— 0.1 to 1.2 0 to 1.5 Stg. 1— 0.1 to 1.2; Stg. 2— 0.1 to 1.0. Stg. 1— 0 to 1.2; Stg. 2— 0 to 1.0. Subbase not included with thermostat; order separately. Operation On a 2-heat thermostat, the two stages of heat make sequentially as the temperature drops. Make refers to the mercury switch initiating a call for heat or cool. There are about 2° F [1° C] between stages so that the second stage makes only when the first stage cannot handle the load. This is the interstage differential. S. M. • Rev. 6-93 • M3375 Recycling Notice This control contains mercury in a sealed tube. Do not place control in the trash at the end of its useful life. If this control is replacing a control that contains mercury in a sealed tube, do not place your old control in the trash. Contact your local waste management authority for instructions regarding recycling and the proper disposal of this control, or of an old control containing mercury in a sealed tube. If you have questions, call Honeywell at 1-800-468-1502. M3375 • ©Honeywell Inc. 1993 • Form Number 69-0580—2 Installation Fig. 1—Installation of subbase on outlet box. WHEN INSTALLING THIS PRODUCT… 1. Read these instructions carefully. Failure to follow them could damage the product or cause a hazardous condition. 2. Check the ratings given in the instructions and on the product to make sure the product is suitable for your application. 3. Installer must be a trained, experienced service technician. 4. After installation is complete, check out product operation as provided in these instructions. ! HORIZONTAL OUTLET 1 BOX SUBBASE 1 NOT INCLUDED WITH UNIT. M3703 Fig. 2—Installation of subbase on wall. CAUTION 1. Disconnect power supply to prevent electrical shock or equipment damage. 2. To prevent interference with the thermostat linkage, keep wire length to a minimum and run wires as close as possible to the subbase. 3. Do not overtighten thermostat captive mounting screws, because damage to subbase threads can result. 4. Do not short across terminals of systems controls. This can burn out the thermostat heat anticipator. WALL WIRES THROUGH WALL OPENING WALL ANCHORS (2) IMPORTANT: Thermostats are calibrated at the factory by using subbases mounted at true level. Inaccurate subbase leveling will cause thermostat control deviation. M926 MOUNTING HOLES SUBBASE MOUNTING SCREWS (2) Fig. 3—Subbase components and leveling procedure. LOCATION Locate the subbase about 5 ft [1.5 m] above the floor in an area with good air circulation at average temperature. Do not mount the subbase where the thermostat may be affected by: — drafts or dead spots behind doors and in corners. — hot or cold air from ducts. — radiant heat from sun, appliances or fireplace. — concealed pipes and chimneys. — unheated (uncooled) areas such as an outside wall behind the thermostat. SPIRIT LEVEL MOUNTING THE SUBBASE The thermostat subbase can be mounted on a horizontal outlet box or directly on the wall. 1. To mount on a horizontal outlet box, install the subbase on the outlet box as shown in Fig. 1. For a wall installation, hold the subbase in position and mark holes for the anchors (Fig. 2). Obtain wall anchors locally. Take care that the wires do not fall back into the wall opening. Set aside subbase. Drill two 3/16 in. [4.8 mm] holes and gently tap anchors into the holes until flush with the wall. 2. Pull electrical wires through the cover plate (if used) and subbase cable opening (Fig. 3). See Wiring the Subbase section before pulling any wires. MOUNTING HOLES (2) TOP MOUNTING HOLES (2) WIRING TERMINAL POST (2) FOR MOUNTING THERMOSTAT THERMOSTAT CABLE OPENING TO SPRING FINGER CONTACTS ON THE THERMOSTAT (UP TO 12) M927 4. Level the subbase using a spirit level, as shown in Fig. 3, and firmly tighten the subbase mounting screws. The subbase mounting holes allow minor out-of-level adjustments. IMPORTANT: An incorrectly leveled subbase will cause the temperature control to deviate from set point. WIRING THE SUBBASE All wiring must comply with local electrical codes and ordinances. Follow equipment manufacturer wiring instructions when available. To wire subbase: 1. Connect wires to the subbase terminals. Refer to Figs. 6-10 for wiring diagrams of typical zone systems. A IMPORTANT: Use 18 gauge, color-coded thermostat cable for proper wiring. 3. Secure the subbase with the screws provided. Do not fully tighten the subbase screws. 2 letter code is located near each subbase terminal for identification. The terminal barrier permits straight or conventional wraparound wiring connection (Fig. 4). 2. Some Q674 Subbases have RC and RH terminals for isolated heating and cooling transformers. For zoning systems, jumper RC and RH terminals as shown in Fig. 5 and wire as single R terminal. 3. Firmly tighten each terminal screw. 4. Fit wires as close as possible to the subbase. Push excess wire back into hole. 5. Plug the hole with nonflammable insulation to prevent drafts from affecting the thermostat. Fig. 5—Jumper RC and RH terminals for single transformer system. Strip wire 3/4 in. [19 mm]. RC RH Fig. 4—Wiring connections. FOR STRAIGHT INSERTION– STRIP 5/16 in. [8 mm] FOR WRAPAROUND– STRIP 7/16 in. [11 mm] RC BARRIER SUBBASE TERMINAL SCREW RH M928 M929 Fig. 6—Typical hookup for MM-2 Mini-zone Control Panel with T874A Thermostat/Q674B,D Subbase in single-stage heating-cooling two-zone system. T874A THERMOSTAT/ Q674D SUBBASE T874A THERMOSTAT/Q674B SUBBASE O G B 4 4 3 2 Y1 RC RH W1 W2 Y1 Y2 3 Y2 RC RH W2 W1 MINIZONE (MM-2) CONTROL PANEL HEAT RELAY COOL RELAY ZONE 1 RELAY ZONE 2 RELAY Y2 Y1 O G2 TO SINGLESTAGE HEATING/ COOLING EQUIPMENT CHANGEOVER CONTROL G1 ZONE 1 ZONE 2 RC COOL O1 T6 T6 RH FAN G1 T5 T5 B HEAT B1 T4 T4 B M6 M6 24 V, 40 VA 2 M4 M4 TRANSFORMER 1 M1 M1 W2 W1 E 4 L2 1 5 6 Z 4 1 2 3 5 6 Z DAMPER ACTUATOR DAMPER ACTUATOR L1 (HOT) X 1 2 3 X 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. 2 ZONE 1 O AND B TERMINALS MUST BE CONNECTED FOR PROPER SYSTEM OPERATION. 3 JUMPER RC AND RH TERMINALS TOGETHER AND WIRE AS SINGLE R TERMINAL. 4 DO NOT CONNECT W2 AND Y2 TERMINALS TO CONTROL PANEL. 3 M1633 69-0580—2 MOUNTING THE THERMOSTAT 1. Remove the thermostat cover by pulling the bottom edge of the cover outward away from the base until it snaps free from the cover clip. spring fingers are not bent flat, preventing proper electrical contact with the subbase. 4. Set the heat anticipator indicator(s) to 0.1A for proper system operation (Fig. 11). 5. Note the two tabs on the top inside edge of the thermostat base. The tabs fit into the corresponding slots on the top of the subbase. Mount the thermostat on the subbase. See Fig. 12. 6. Align the two captive mounting screws in the thermostat base with the posts on the subbase (Fig. 12). Tighten both screws. Do not overtighten the screws or damage to the subbase posts can result. NOTE: The cover is hinged at the top and is removed by pulling out at the bottom. 2. Carefully remove and discard the polystyrene packing insert that protects the mercury switches during shipment. 3. Turn over the thermostat base and note the spring fingers that engage the subbase contacts. Make sure the Fig. 7—Typical hookup for MABS II and MABS II-L Control Panels with T874A Thermostat/Q674B,D Subbases in single-stage heating-cooling zone system. MABS II Control Panel shown; MABS II-L Control Panel hookup is the same. 2 3 O G B Y1 RC 4 RH T874A THERMOSTAT/ Q674D SUBBASE T874A THERMOSTAT/ Q674D SUBBASE T874A THERMOSTAT/Q674B SUBBASE 2 4 Y1 W1 W2 Y2 2 4 Y2 RC RH W2 W1 Y1 Y2 RC RH W2 W1 MABS II CONTROL PANEL EM. HEAT SECOND FAN STAGE RELAY RELAY RELAY HEAT RELAY COOL RELAY Y 2 Y 1 O TO SINGLESTAGE HEATING/ COOLING EQUIPMENT G 2 G 1 R C R H B W 2 W 1 E CHANGEOVER CONTROL COOL FAN ADD-AZONE A HEAT 4 A EM. HEAT 3 A 24 V, 40 VA 2 A TRANSFORMER 1 O 1 G 1 B 1 E 1 2 1 CAC RELAY ZONE 1 ZONE 2 RELAY RELAY ZONE 3 RELAY ZONE 1 ZONE 2 ZONE 3 T 8 T 7 T 6 T 5 T 4 M 6 M 4 M 1 T 8 T 7 T 6 T 5 T 4 M 6 M 4 M 1 T 8 T 7 T 6 T 5 T 4 M 6 M 4 M 1 1 L2 4 5 6 Z 4 DAMPER ACTUATOR L1 (HOT) 1 2 3 5 6 Z 4 DAMPER ACTUATOR X 1 2 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. 2 JUMPER RC, RH TOGETHER AND WIRE AS SINGLE R TERMINAL. 3 ZONE 1 O AND B TERMINALS MUST BE CONNECTED FOR PROPER SYSTEM OPERATION. 4 DO NOT CONNECT W2 AND Y2 TERMINALS TO CONTROL PANEL. 3 5 6 Z DAMPER ACTUATOR X 1 2 3 X M1634 4 Fig. 8—Typical hookup for MABS II and MABS II-L Control Panels with T874D Thermostat/Q674B,D Subbases in multistage heating-cooling zone system. MABS II Control Panel shown; MABS II-L Control Panel hookup is the same. 2 RC O G B 3 2 4 Y2 W2 Y1 T874D THERMOSTAT/ Q674D SUBBASE T874D THERMOSTAT/ Q674D SUBBASE T874D THERMOSTAT/Q674B SUBBASE RC Y2 RH W1 2 4 W2 Y1 RC Y2 RH W1 4 W2 Y1 4 5 RH W1 MABS II CONTROL PANEL EM. HEAT SECOND FAN STAGE RELAY RELAY RELAY HEAT RELAY COOL RELAY CAC RELAY ZONE 1 ZONE 2 RELAY RELAY ZONE 3 RELAY O ZONE 1 ZONE 2 ZONE 3 G2 T8 T8 T8 CHANGEOVER CONTROL T7 T7 T7 COOL O1 T6 T6 T6 FAN G1 T5 T5 T5 Y2 Y1 TO SINGLESTAGE HEATING/ COOLING EQUIPMENT G1 RC RH ADD-A-ZONE B A4 HEAT B1 T4 T4 T4 W2 A3 EM. HEAT E1 M6 M6 M6 W1 A2 24 V, 40 VA 2 M4 M4 M4 E A1 TRANSFORMER 1 M1 M1 M1 1 L2 4 5 6 Z 4 1 2 3 5 6 Z DAMPER ACTUATOR DAMPER ACTUATOR L1 (HOT) X 1 2 3 X 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. 2 JUMPER RC, RH TOGETHER AND WIRE AS SINGLE R TERMINAL. 3 ZONE 1 O AND B TERMINALS MUST BE CONNECTED FOR PROPER SYSTEM OPERATION. 4 IF SINGLE-STAGE COOLING, DO NOT CONNECT Y2; IF SINGLE-STAGE HEATING, DO NOT CONNECT W2. 5 6 Z DAMPER ACTUATOR 1 2 3 X M1393A 69-0580—2 Fig. 9—Typical hookup for MABS XX Control Panel with T874A Thermostat/Q674B,E Subbases in singlestage heating-cooling zone system. MABS XX CONTROL PANEL ZONE 1 FAN HEAT COOL ZONE 2 FAN HEAT COOL ZONE 3 FAN HEAT COOL 1 MCM CAC 2 FC 3 ZONE 2 FAN ZONE ZONE 3 FAN SYS ZONE ADD-AZONE ZONE 1 FAN SYS ZONE SYS 4 5 6 DAMPER TO SINGLESTAGE HEATING/ COOLING EQUIPMENT DAMPER DAMPER 7 8 Y W G Gh O B RC RH G Y R W M6 M4 M1 VO VC OPEN ZONE 1 1 2 CLOSE OPEN CLOSE OPEN CLOSE ZONE 3 ZONE 2 G Y R W 9 M6 M4 M1 VO VC G G G G Y1 Y1 Y1 Y2 Y2 Y2 R R R W1 W1 W1 Y R W M6 M4 M1 VO VC 1 L2 L1 (HOT) 2 2 W2 O O 4 B T874A THERMOSTAT/ Q674B OR E SUBBASE 2 W2 5 6 Z 1 2 3 4 B DAMPER ACTUATOR X 5 6 Z 1 2 3 O 4 B DAMPER ACTUATOR T874A THERMOSTAT/ Q674B OR E SUBBASE W2 X T874A THERMOSTAT Q674B OR E SUBBASE 5 6 Z DAMPER ACTUATOR 1 2 3 X 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. 2 WIRE ONLY THE TERMINAL CONNECTIONS SHOWN. SOME TERMINALS NOT AVAILABLE ON ALL THERMOSTATS. IF THERMOSTAT HAS R/RC/RH TERMINALS, JUMPER TOGETHER AND WIRE AS SINGLE R TERMINAL. DO NOT CONNECT THERMOSTAT O AND B TERMINALS TO CONTROL PANEL. M1636 6 r Settings Checkout Before beginning checkout of thermostat operation, set switches on the control panel for the desired system operation. See instructions provided with the control panel. Control Panel Mini-zone MABS II MABS II-L MABS XX To set up the system for thermostat checkout, adjust each thermostat settings as shown in Table 5. TABLE 5—SYSTEM SET-UP FOR THERMOSTAT CHECKOUT. Heating Cooling Zones Other Zones Other Zone 1 Than Zone 1 Zone 1 Than Zone 1 Set thermostat Move the heating set Set thermostat Move the cooling set system switch to point lever 10° F system switch to point lever 10° F HEAT; set fan switch [6° C] below room COOL; set fan [6° C] above room to AUTO. Move the temperature. switch to AUTO. temperature. heating set point Move the cooling lever 10° F [6° C] set point lever 10° F below room [6° C] above room temperature. temperature. On all zone thermostats, set the system On all zone thermostats, set the system switch to HEAT; set the fan switch to AUTO. switch to COOL; set the fan switch to AUTO. Move the heating set point lever 10° F [6° C] Move the cooling set point lever 10° F [6° C] below room temperature. above room temperature. NOTE: The control panel provides a threeminute time delay when 24V is applied to the control panel and at the end of each equipment cycle. The high-speed fan runs during this time delay. HEATING NOTE: The control panel provides a threeminute time delay when 24V is applied to the control panel and at the end of each equipment cycle. The high-speed fan runs during this time delay. COOLING ! NOTE: If a plenum fan control is used in the heating system, there will be a short delay on a call for heat to allow the furnace to heat the plenum. The fan starts immediately in electric heat systems. Allow 30 seconds for the damper to open or close completely. Make sure all zone thermostats are set as instructed in the Heating column in Table 5. Check each zone thermostat as follows: 1. If thermostat has a fan switch, set it to ON. See Fig. 13. After 30 seconds, place your hand in front of an air register in that zone to check for air flow at the register. 2. Reset fan switch, if provided, to AUTO. After 30 seconds, make sure air flow at register has stopped. 3. Move heating set point lever on zone thermostat 10° F [6° C] above room temperature to call for heat. 4. After 30 seconds (longer, if necessary, for time delay on plenum fan control), check for warm air at the register. 5. Move heating set point lever on the zone thermostat 10° F [6° C] below room temperature to end a call for heat. After 30 seconds (longer, if necessary, for time delay on plenum fan control or control panel), check that air flow at the register has stopped. 6. Repeat steps 1-5 for each zone thermostat. CAUTION Do not operate cooling equipment if outdoor temperature is below 50° F [10° C]. Refer to manufacturer recommendations. Make sure all zone thermostats are set as instructed in the Cooling column in Table 5. Check each zone thermostat as follows: 1. Move cooling set point lever on the zone thermostat 10° F [6° C] below room temperature to call for cooling. 2. After 30 seconds, place your hand in front of an air register in that zone to check for cool air at the register. 3. Move the cooling set point lever on the zone thermostat 10° F [6° C] above room temperature to end the call for cooling. After 30 seconds (longer, if necessary, for time delay on control panel), check that air flow at the register has stopped. 4. Repeat steps 1-3 for each zone thermostat. When system checkout is complete, return all thermostats to the desired settings for normal system operation. 9 69-0580—2 Calibration Fig. 14—Thermometer calibration. THERMOSTAT T874 thermostats are accurately calibrated at the factory. They do not have provision for field calibration. THERMOMETER The thermometer in your thermostat has been accurately calibrated at the factory. The thermometer should only need adjustment if it has been dropped or shifted due to mishandling. If the set point lever and the thermometer reading do not agree: 1. Remove the thermostat cover by pulling up from the bottom of cover until it clears the mounting slots. 2. Set the thermostat cover on a table near an accurate thermometer. 3. Allow ten minutes for the cover thermometer to sense the area temperature; compare the readings. Be careful not to touch the thermometer or breathe on it. 4. If the readings are the same, replace the cover and put the system into operation. 5. If the readings are different, insert a small screwdriver in the thermometer slot (Fig. 14) and turn it until the thermometers have the same reading. 6. Replace the thermostat cover and put the system into operation. M5070 NOTE: Hand heat will offset the thermometer reading. After making each adjustment, wait ten minutes for the thermometer to stabilize before comparing. Home and Building Control Honeywell Inc. 1985 Douglas Drive North Golden Valley, Minnesota 55422 Printed in U.S.A. Home and Building Control Honeywell Limited—Honeywell Limitée 740 Ellesmere Road Scarborough, Ontario M1P 2V9 Helping You Control Your World QUALITY IS KEY